The e-mail groups devoted to antique bikes have frequent messages asking "How do I get a title and registration papers?" It seems that several states didn't have any requirement to issue or check specific title documents. Just as appears to be the case here, neither the current owner nor the purchaser have any clear idea of the past history of the bike.
It is my understanding - though it has no particular basis in stastically verified fact - that the majority of stolen bikes either go to Mexico right away, or are chopped for parts. If that is indeed true, it makes stories like this one quite surprising.
What kind of pre -71 Yamaha could possibly be worth shipping from California to Finland? I mean have a look at the map, we are talking about $hitloads of cost here. The finnish dude should be charged for being criminally silly.